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    <title>Document</title>
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    <div id="sky">
        <div class="moon">
            1-值变量
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    </div>
    <div id="sky1">
        <div class="moon1">
            2-选择器变量
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    </div>
    <div id="sky2">
        3-属性名变量
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    <div id="sky3">
        4-url变量
    </div>
    <div id="sky4">
        5-声明变量
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    <div id="sky5">
        6-变量计算
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    <div id="sky6">
        <div class="moon6">
            6-变量作用域
        </div>
    </div>
    <div id="sky7">
        6-变量计算
    </div>
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